Note flaccid inflatable object (5)
I believe the answer is:
blimp
'inflatable object' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'note flaccid' is the wordplay.
'note' becomes 'b' (musical note).
'flaccid' becomes 'limp' (synonyms).
'b'+'limp'='BLIMP'
Can you help me to learn more?
(Other definitions for blimp that I've seen before include "David Low's cartoon colonel - airship used for publicity" , "Airship - barrage balloon" , "Small barrage balloon" , "returns one pound to provost" , "Small nonrigid airship" .)